php 讀取MAC地址

class GetMacAddr{   
  
       var $return_array = array(); // 返回帶有MAC地址的字串數組   
       var $mac_addr;   
  
       function GetMacAddr($os_type){   
            switch ( strtolower($os_type) ){   
                     case "linux":   
                               $this->forLinux();   
                               break;   
                     case "solaris":   
                               break;   
                     case "unix":   
                               break;   
                     case "aix":   
                               break;   
                     default:   
                               $this->forWindows();   
                               break;   
  
            }   
  
              
            $temp_array = array();   
            foreach ( $this->return_array as $value ){   
  
                      if (   
preg_match("/[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f]/i",$value,   
$temp_array ) ){   
                               $this->mac_addr = $temp_array[0];   
                               break;   
                     }   
  
            }   
            unset($temp_array);   
            return $this->mac_addr;   
       }   
  
  
       function forWindows(){   
            @exec("ipconfig /all", $this->return_array);   
            if ( $this->return_array )   
                     return $this->return_array;   
            else{   
                     $ipconfig = $_SERVER["WINDIR"]."system32ipconfig.exe";   
                     if ( is_file($ipconfig) )   
                        @exec($ipconfig." /all", $this->return_array);   
                     else  
                        @exec($_SERVER["WINDIR"]."systemipconfig.exe /all", $this->return_array);   
                     return $this->return_array;   
            }   
       }   
  
  
  
       function forLinux(){   
            @exec("ifconfig -a", $this->return_array);   
            return $this->return_array;   
       }   
  
}   
//方法使用   
//$mac = new GetMacAddr(PHP_OS);   
//echo $mac->mac_addr;